California's vigorous embrace of Obamacare, particularly its sharp expansion of Medi-Cal coverage for the poor, has reduced the state's medically uninsured population by half, a new Census Bureau report says. Three years ago, California had one of the nation’s lowest rates of medical insurance coverage, with 17.2 percent of its nearly 40 million residents lacking coverage, but by 2015, its uninsured rate had dropped to 8.6 percent, the Census Bureau study found. more